5.3 in a 98 chevy truck. It ran great for two weeks, no problems. Now it keeps running when I turn the key off. I disconnected the ignition power wire from the truck to the pcm/harness (wired standalone, so one power wire from teh truck to the 5.3 harness) and it kept running, so it's on the pcm/engine side, not the truck side. Any ideas where it's getting feedback power from after 2 weeks of running properly?